well what would you guys expect? thats how naruto is, its not like he's going to stand there and calculate the radius of the area and then do aton of fancy calculations and then when it looks like he failed he somehow manages to win and explains every single little step to the reader/enemy
..its naruto , he's simple minded and he used kage the first time to gain experience on fighting, the second time it worked out (thats his character, he's not meant to be complex and dextrous)